if_clone_destroyif
err = if_clone_destroyif(ifc, ifp);
int if_clone_destroyif(struct if_clone *, struct ifnet *);
error = if_clone_destroyif(ifc, oifp);
error = if_clone_destroyif(cloner, ifp);
if_clone_destroyif(wlan_cloner, vap->iv_ifp);